Hi,
Just like with M1, M2 uses a highly aggressive and lossy image compression, so product images appear blurry.
For main product images, this is fixed like this:
http://magento.stackexchange.com/questions/113165/how-to-increase-the-quality-of-product-photos-jpg-...
http://magento.stackexchange.com/questions/127127/how-to-increase-the-quality-of-product-photos-jpg-...
However, images STILL appear blurry in category overview because the image is resized by Magento to 300x270px then upscaled by our template, so there's a loss in quality.
How can this be fixed or prevented?
Thanks!